The quoler was an Osirrag-inhabiting planet's aquatic species. They were the main aquatic food source for the onahk.
Quolers made their homes in underwater burrows that they excavated beneath the surface of the shallow, temperate marshes and wetlands of Osirrag. The native onahks, amphibians that hunted in the wetlands during the summer and fish in the winter, preyed on them. To reach quoler burrows, these nimble animals could easily maneuver around underwater obstructions such as roots. Humans, or any creatures that were bigger than the quolers they usually ate, made Onahks afraid.